B.
two representative Assemblies and one powerful Senate
Basically, France owned everything west from the Appalachian Mountains...as far down as Louisiana extending up to the Eastern Canadian Coastline as well as being far out into Minnesota. This was due to the Treaty of Utrecht btw.
There's no perfect answer to this question (even the question acknowledges this problem). In my opinion, the U.S. was put on a path to Civil War the very moment the U.S. Constitution was signed. The Constitution brought a bunch of colonies into a union together, even though some of those colonies relied heavily on slavery and believed that slavery was morally defensible, while others did not rely on slavery and believed that slavery was a terrible thing. It was only a matter of time before the debate over slavery turned into a violent clash over slavery.